Exercise
1. Why do organisms take food?
2. Distinguish between a parasite and
3. How would you test the presence of
4. Give a brief description of the process
5. Show with the help of a sketch that
food.
Answers
Answer:
1. Organisms need to take food to get energy and perform life processes. A living organism undergoes many life processes like nutrition, respiration, digestion, transportation, excretion, circulation of blood, and reproduction. To perform all these life processes the organism needs energy and nutrients.
2. A parasite is a living organism, which takes its nourishment and other needs from a host; the host is an organism which supports the parasite. ... The hosts vary depending on whether they harbor the various stages in parasitic development.
3. Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour).
4. Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
5......the attached image is the answer of 5 question..
Explanation:
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Here is your answer ✌️
1. Organisms need to take food to get energy and perform life processes. A living organism undergoes many life processes like nutrition, respiration, digestion, transportation, excretion, circulation of blood, and reproduction. To perform all these life processes the organism needs energy and nutrients.
2. Parasites are organisms that depend upon another organism (host) for food and cause harmful effects or dieseases to the host. Examples: Cuscuta (Amarbel), mosquitoes and head lice. saprotrophs are orgnisms that obtain nutrition from dead and decaying organic matter. Examples: Fungi and some bacteria.
3. Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour).
4. Photosynthesis is defined as the process in which the chlorophyll-containing plant cells synthesize food in the form of carbohydrates, using carbon dioxide and water in the presence of solar energy.
Sources of raw materials required for photosynthesis:
a)Water is taken in, from the roots of the plants and is transported to leaves.
b)Carbon dioxide from the air enters the leaves through the pores called stomata and diffuses to the cells containing chlorophyll.
c)Solar energy is used to break water into hydrogen and oxygen. This hydrogen is combined with carbon dioxide to form food for the plants, which is ultimately used by the animals as well.
This photosynthesis can be represented by the following equation.
Carbondioxide+Water→Carbohydrates+Oxygen.
This reaction takes place in chlorophyll in the presence of sunlight.
5. Refer to the attachment ✌️
